I've recently been looking at Clojure, still trying to understand the key 
ideas. I went to write some regex code, and was surprised to see that 
re-matcher returns a mutable object.

I am curious about this. It could simply be that creating an immutable 
version is low on the priority list. Or, it could be that I'm missing 
something basic, and if so, it'd be very useful to understand.

--Jon

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